11555548640 has 24 divisors (see below), whose sum is σ = 27299984040. Its totient is φ = 4622219392.

The previous prime is 11555548633. The next prime is 11555548661. The reversal of 11555548640 is 4684555511.

It is a junction number, because it is equal to n+sod(n) for n = 11555548591 and 11555548600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36110930 + ... + 36111249.

It is an arithmetic number, because the mean of its divisors is an integer number (1137499335).

Almost surely, 2^11555548640 is an apocalyptic number.

11555548640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11555548640 is an abundant number, since it is smaller than the sum of its proper divisors (15744435400).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11555548640 is an equidigital number, since it uses as much as digits as its factorization.

11555548640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72222194 (or 72222186 counting only the distinct ones).

The product of its (nonzero) digits is 480000, while the sum is 44.

The spelling of 11555548640 in words is "eleven billion, five hundred fifty-five million, five hundred forty-eight thousand, six hundred forty".